It's said that a large number of network connectivity problems are due to the media, but still many people skip checking the cables and jump straight into software troubleshooting, spending perhaps hours of wasted effort before the actual problem is found.
There's multiple approaches to troubleshooting (top-down, bottom-up, divide-and-conquer), the correct one to take will often depend on the situation. Often the best way too approach something is not to try to decide which layer is likely to contain the issue, but to first rule out other layers by checking them individually, so that you're left troubleshooting only the layers that have a possibility of containing the issue.
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